GTC CT8007 Cordless Polarity Computer-Safe Circuit Tester<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>No Ground or clip required which means no wire tangles nor time lost searching for grounding points</li><li>High Impedance electronic circuitry with negligible current draw ( 1 microampere) is 30，000 times less than regular lamp type testers allowing for complete safety when working around sensitive electronic control modules and sensors</li><li>Operating range between 6 and 28 volt DC in battery powered systems</li><li>Liquid crystal display indicates "CIRCUIT OK +" on contacting positive voltages， and "CIRCUIT OK -" on contacting negative voltages</li><li>Lightweight high strength plastic construction with cap and  clip and uses no batteries and maintenance free</li></ul></div><img src="http://ecx.images-amazon.com/images/I/31sl7fUWVoL.jpg" noproxy>